NEW YORK — The NHL Players’ Association heard responses from the league on a new proposal centering on two key issues Thursday, as bargaining intensified in a third straight day of talks at what had been an unspecified location in Manhattan.

That location turned out to be the offices of Proskauer Rose, the Midtown law firm that has advised the NHL on its strategy of imposing lockouts in labor disputes in 1994, 2004 and earlier this year.